Grouping multiple test cases in a class

In this section, we will dive deep into grouping the test cases in a class.

Make sure to prefix your class with Test otherwise the class will be skipped.

Also, remember that the method names within the class should follow the pytest standards as test_% or %_test

# content of 3_group_tests.py

class TestClass:

def test_method_one(self):

x = "group"

assert "r" in x

def test_method_two(self):

x = "hello"

assert hasattr(x, "check")

Grouping test cases in classes can be beneficial for the following reasons:

Organizing test cases.
Sharing fixtures for tests only in that particular class.
Applying marks at the class level and having them implicitly apply to all tests.

Though, you group multiple test cases within the same class, each test has a unique instance of the class.

# content of 4_class_isolation_test.py

class TestClassInstanceIsolation:

value = 0

def test_method_one(self):

self.value = 5

assert self.value == 5

def test_method_two(self):

assert self.value == 5

Note that attributes added at class level are class attributes, so they will be shared between tests.

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